Malicious PDF — malware analysis report

Static analysis result for SHA-256 712cd9d549f3ab51…

MALICIOUS

PDF

78.7 KB Created: 2021-03-24 19:51:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f10fcf84516403f3748dc6cccd01d778 SHA-1: f0625ac1e7d020eb2177fd174424b2c9f5fb8065 SHA-256: 712cd9d549f3ab51637607b3a21baf196a27ea21b9a71c1540deb79cd1710e8c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be related to search results, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/wix?keyword=kubler+ross+on+death+and+dying+pdf PDF link annotation
    • http://pugalibapuf.iblogger.org/67903793753.pdfIn PDF document text
    • http://ulekschool.online/39226093496l7pn0.pdfIn PDF document text
    • http://tikovg.xyz/zabinegexikegutumoxadarenpibf.pdfIn PDF document text
    • http://0fruit.space/tosuxegdsopf.pdfIn PDF document text
    • http://ita-talia.fun/92163695930mfvkp.pdfIn PDF document text
    • http://ruwemipuwev.mypressonline.com/la_celestina_tragicomedia_de_calisto_y_melibea.pdfIn PDF document text
    • http://nebofimanigi.sportsontheweb.net/pdf_markup_app_windows_10.pdfIn PDF document text
    • http://vumamanepu.sportsontheweb.net/affidavit_format_for_name_spelling_mistake.pdfIn PDF document text
    • http://flowerport.market/gopigawoxavubiji3tjxs.pdfIn PDF document text
    • http://muwawukiseka.iblogger.org/46752564458.pdfIn PDF document text
    • http://xevamoz.mygamesonline.org/48472187141.pdfIn PDF document text
    • http://socialwave.me/wuzunxjuyu.pdfIn PDF document text
    • http://netewe8.xyz/50912911137vms4g.pdfIn PDF document text
    • http://dabedera.mygamesonline.org/new_government_accounting_system_philippines.pdfIn PDF document text
    • http://replyua.site/37375111015l9wn9.pdfIn PDF document text
    • http://porn77.design/lapifasenalotinafafax4yiw.pdfIn PDF document text
    • http://runmasten.online/brad_geary_navy_sealgyb43.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jujobope.atwebpages.com/60358288596.pdfIn PDF document text
    • http://sugekix.rf.gd/50604112182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5689bd92-886a-42d6-8f45-6d59f849d0b4/11333344254.pdfIn PDF document text
    • http://fidegaf.atwebpages.com/91003568551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c384054-c4d8-441d-af8e-90d0ae0843bb/zepojusizevopagubajago.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 5512 bytes
SHA-256: 0efe04bd914d375ec9e9c6bbf899ce677b6a872db83a0ae0b16b5a4882074f11
font_01_sfnt_off00010997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10997 10560 bytes
SHA-256: f35e00b659d6c226124046a71adee2c11becbf39df5dae15198c355230120629

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